diff --git a/libs/libcommon/src/DateLUTImpl.cpp b/libs/libcommon/src/DateLUTImpl.cpp
index c05a3d4bf8a..693a811ece2 100644
--- a/libs/libcommon/src/DateLUTImpl.cpp
+++ b/libs/libcommon/src/DateLUTImpl.cpp
@@ -34,17 +34,9 @@ UInt8 getDayOfWeek(const cctz::civil_day & date)
 
 }
 
-
-__attribute__((__weak__)) extern bool inside_main;
-
 DateLUTImpl::DateLUTImpl(const std::string & time_zone_)
     : time_zone(time_zone_)
 {
-    /// DateLUT should not be initialized in global constructors for the following reasons:
-    /// 1. It is too heavy.
-    if (&inside_main)
-        assert(inside_main);
-
     cctz::time_zone cctz_time_zone;
     if (!cctz::load_time_zone(time_zone, &cctz_time_zone))
         throw Poco::Exception("Cannot load time zone " + time_zone_);